Festivals and Events are definitely a part of tourism's Growth Markets - and will always remain a staple of the industry. As such, the Internet is full of great resources on the subject. Below is just a sampling of what's out there:
Here are a couple of resources on the topic:
And it's helpful to know there are many state-based festival associations; here's a sampling:
North Carolina http://www.ncfestivals.com/
.....and many more!
And there are international festival groups, associations and resources: